Method for the preparation of fine globular particles of yttrium

Details Method for the preparation of fine globular particles of yttrium Method for the preparation of fine globular particles of yttrium

1997-11-13

1999-03-09

Straub, Gary P.

Chemistry of inorganic compounds

Rare earth compound

23295R, 23301, 23305RE, 4234151, 4234191, 501 94, 502 8, 502 9, 502 10, C01F 1700

Patent

active

058796479

ABSTRACT:
An improvement is proposed in the so-called urea method for the preparation of fine particles of yttrium oxide, according to which, while an aqueous reaction mixture containing a water-soluble yttrium salt, e.g., nitrate, and urea dissolved therein in specified concentrations is heated at 90.degree. to 100.degree. C. to effect precipitation of yttrium carbonate hydroxide particles followed by calcination of the carbonate hydroxide in air into yttrium oxide, the aqueous reaction mixture is diluted with addition of a specified volume of preheated water within a critical period between incipient appearance of turbidity in the reaction mixture by the precipitation of the carbonate hydroxide and a moment 30 minutes thereafter. In this way, the yttrium oxide particles obtained have a globular particle configuration with a very small average particle diameter D.sub.50 in the range from 0.1 to 0.3 .mu.m and are suitable for use in various fine applications.

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Journal of Colloid and Interface Science, vol. 122, No. 1, pp. 47-59, Mar. 1988.
Skoog, Douglas A.& West, Donald M. Fundamentals of Analytical Chemistry. "The Technique of Homogeneous Precipitation". Hotl, Rine & Winston, Inc. : New York. Copyright 1963. pp. 188-191.

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